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A huge problem with the DMCA exemptions process: the exemptions never allow sharing of tools to achieve the allowed circumventions. So stuff like https://torrentfreak.com/google-takes-down-repositories-that-circumvent-its-widevine-drm-201113/ makes them near useless. Freedom to dice your veggies how you like, but oh, obtaining a knife is illegal.
by "never allow" I mean "never explicitly allow" -- we should insist that sharing the tools *is* allowed in order to achieve the exemptions. But lack of clarity means people will be hesitant to share the tools and put themselves at risk.